>John Cowan replied:
>>Combining-slash decompositions are considered to be over the top:
>>they're impossible to recombine at the glyph level accurately,
>>because the position of the slash varies randomly depending on the
>>base letter.
>
>This is not very convincing. The same thing is true also with many other
>combining characters. Even a diaresis, or an acute accent do look different
>on different base characters (e.g. small and capital letters).

As a font designer I assure you it is quite convincing. The "floating"
diacritics can interact with the bounding box. Superimposed diacritics have
to interact in other ways.